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Old 22 July 2007, 09:18   #1
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2 stroke oil to petrol ratio

I have just perchased a Mariner 30HP 2 stroke engine, and am not sure of the oil to petrol ratio. Can any one help. Is it the same for all engines????
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Old 22 July 2007, 10:24   #2
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I have just perchased a Mariner 30HP 2 stroke engine, and am not sure of the oil to petrol ratio. Can any one help. Is it the same for all engines????
Just remember - within reason - the more oil the longer the engine will last. The problem is too much oil and you will foul your plugs.

Often engines are made to run on 50:1 or 100:1 just for environmental reasons. A lot also depends on how you will use the engine. Loads of low speed running at tickover and you don't want too much oil. If you are bombing around on full throttle then the more oil the better.

I would say 50:1 is ahbout the norm these days - very hard use go to 30:1.
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Old 22 July 2007, 13:46   #3
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I have just perchased a Mariner 30HP 2 stroke engine, and am not sure of the oil to petrol ratio. Can any one help. Is it the same for all engines????

Your particular engine uses 50:1-ie half a litre of 2 stroke oil to a 25 litre fuel tank. Half litre coke bottles are useful!
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Old 23 July 2007, 06:24   #4
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Quite a lot of the 500ml or 1l bottles of oil have graduated panels on the side. Means you have to buy one lot at a higher price of course. Put a full one on the boat in case you need more fuel later.
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Old 24 July 2007, 16:03   #5
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Depends how old it is, newer 2 stroke 30hps are 100:1 if its getting on a bit run it at 50:1. It will be just like an old man taking cod liver oil!!
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Old 24 July 2007, 18:45   #6
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Depends how old it is, newer 2 stroke 30hps are 100:1 if its getting on a bit run it at 50:1. It will be just like an old man taking cod liver oil!!
Yes but they are 100:1 for the sake of the environmental laws - NOT the health of the engine!!!
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Old 26 September 2007, 13:21   #7
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Go to Tesco and buy one of their "own brand" herb bottles (basil will do)....The bottle is marked 14g. Do whatever you like with the herbs, but empty the bottle and then wrap it with some tape (in case you drop it)....And now the smart bit...One herb bottle of 2-stroke oil to one 5L petrol can...Is EXACTLY the right mix.
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Old 26 September 2007, 13:42   #8
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2 Stroke Oil Ratio

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Originally Posted by howard6212 View Post
I have just perchased a Mariner 30HP 2 stroke engine, and am not sure of the oil to petrol ratio. Can any one help. Is it the same for all engines????
Hello, 2 stroke engine are my speciality. When new you should use 25:1 for the first 10 hours at a given rpm speed (Chart available) after the break in period use 50:1 under normnal boating conditions, from not sustained full throttle speeds to normal cruising at slow or idle speeds. Use only TCW3/ 2 stroke engine oil ratios.

Your engine model is currently made by Tohatsu in Japan and sold as a Mariner brand, have lots of technical information because work with this nice brand and use same engine model. if you want email me to send precise information about what you are asking and other interesting general issues.

Best regards from Peru
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locozodiac@hotmail.com
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Old 26 September 2007, 16:33   #9
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The fame of Ribnet spreads!!!

Have you ever used your boat on lake Titicaca?
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Old 04 October 2007, 19:00   #10
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Boat on Lake Titicaca

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The fame of Ribnet spreads!!!

Have you ever used your boat on lake Titicaca?
Answering you question, the answer is no, Lake Titicaca is about 4 thousand meters high above sea level, because of high altitude, engines losses between 15 to 20% of performance efficiency each one thousand meters above sea level. In order to perform better to well, not optimal, you must change the carburator's main jet and propeller pitch. This will reduce greatly the mormal performance loss experienced as a result of reduced oxygen in the air causing an overly rich fuel mixture. Outboard engines perform well till about 800 meters high, without changing anything.

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